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Thermodynamics
Q 1 What is an adiabatic process?
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Q 2 What is an isothermal process?
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Q 3 Can the Carnot engine be realized in practice?
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Q 4 An ideal gas is compressed at a constant temperature, will its internal energy increase
or decrease?
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Q 5 Which thermodynamic variable is defined by (a) Zeroth law of thermodynamics (b)
First law of thermodynamics?
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Q 6 Can whole of heat be converted into work?
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Q 7 A refrigerator is to maintain eatables kept at 90C. If room temperature is 360C,
calculate the coefficient of performance.
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Q 8 What happens to the rate of loss of heat when small temperature difference between a liquid and its
surroundings is doubled?
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Q 9 What is critical temperature?
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Q 10 What is internal energy of a system?
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Q 11 What is zeroth law of thermodynamics?
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Q 12 What is Clausius statement of second law of thermodynamics?
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Q 13 What is a quasi-static process?
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Q 14 A gas is compressed isothermally to half its volume. By what factor does the pressure of the gas
increase?
= 1.4
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Q 15 Calculate the efficiency of a Carnot’s engine working between steam point and ice
point.
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Q 16 State Kelvin-Planck statement of second law of thermodynamics.
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Q 17 Explain why two bodies at different temperatures T 1 and T2, if brought in thermal contact do not
necessarily settle to the mean temperature (T 1 + T2) / 2 ?
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Q 18 State first law of thermodynamics.
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Q 19 A Carnot engine takes steam at 2000C and after performing work, exhausts it to a
sink at 1000C. Calculate the percentage of heat which is utilized for doing work.
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Q 20 Explain a Carnot engine.
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Q 21 What amount of heat must be supplied to 2 10-2kg of nitrogen at room
temperature to raise its temperature by 450C at constant pressure? Given molecular mass
of nitrogen is 28 and R = 8.3 Jmole-1K-1.
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Q 22 A sample of ideal gas(
= 1.4) is heated at constant pressure. If an amount of 140 J of heat is
supplied to the gas, find (a) change in internal energy of the gas (b) work done by the gas?
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Q 23 Explain a refrigerator.
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Q 24 A sample of gas (
= 1.5) is taken through an adiabatic process in which the volume is compressed
from 1600cc to 400cc. If the initial pressure is 150kpa, what is the final pressure and how much work is
done on the gas in the process?
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Q 25 A certain gas at atmospheric pressure is compressed adiabatically so that its volume becomes half of
its original volume. Calculate the resulting pressure in Nm-2. Given
= 1.4 for air
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Q 26 Calculate the increase in internal energy of 1kg of water at 1000C when it is
converted into steam at the same temperature and 1atm(100kpa). The density of water
and steam are 1000 kg/m3 and 0.6 kg/m3 respectively. The latent heat of vaporization of
water = 2.25 106 J/kg.
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